Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (538)
Games in Android Showcase (132)
games submitted by our members
Games in WIP (600)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  gluPerspective & gluOrtho2D  (Read 1386 times)
0 Members and 1 Guest are viewing this topic.
Offline Mr_Ridd

Senior Newbie




Java games rock!


« Posted 2004-01-16 09:12:50 »

Howzit

I wrote a method that accepts a width and a height, which then goes and paints quads on the screen at the revelant places. I did this using gluOrtho2D and glTranslatef and it works perfectly.

Then I change to gluPerspective and I draw a small quad in the center of the screen also with glTranslatef.

When I press the arrow keys I increase/decrease the x or y values as needed to get the background to move around.

The problem comes in when I press the arrow keys. The small block in the middel of the screen dissappears.
The background is still there though.

What can I do?
Offline aldacron

Senior Devvie


Medals: 9
Exp: 16 years


Java games rock!


« Reply #1 - Posted 2004-01-16 13:15:07 »

There's no need to use translatef on the background since you're rendering in an ortho projection. All you need do ise set the ortho projection bounds to the dimensions of the screen/window. For example, with a resolution/window size of 800x600, the call might look like this:

gluOrtho2D(0,800,0,600);

Using the above, 0,0 will be in the lower left corner of the screen. Doing it this way:

gluOrtho2D(0,800,600,0);

puts (0,0) in the upper left corner. Then to render a quad you can use screen coordinates rather than world coordinates.
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

rwatson462 (29 views)
2014-12-15 09:26:44

Mr.CodeIt (20 views)
2014-12-14 19:50:38

BurntPizza (40 views)
2014-12-09 22:41:13

BurntPizza (75 views)
2014-12-08 04:46:31

JscottyBieshaar (37 views)
2014-12-05 12:39:02

SHC (50 views)
2014-12-03 16:27:13

CopyableCougar4 (47 views)
2014-11-29 21:32:03

toopeicgaming1999 (113 views)
2014-11-26 15:22:04

toopeicgaming1999 (100 views)
2014-11-26 15:20:36

toopeicgaming1999 (30 views)
2014-11-26 15:20:08
Resources for WIP games
by kpars
2014-12-18 10:26:14

Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!